A high-pass filter is a network formed by capacitors and coils designed to let frequencies above a certain value pass without attenuation, but blocking frequencies under that value. Depending on the number of coils and capacitors, the high-pass filter can have different designations as shown in the figure.
Formula 1
Where:
fc is the cutoff frequency in hertz (Hz)
L is the inductance in henrys (H)
C is the capacitance in farads (F)
PI = 3,1416
Application Example:
Calculate the cutoff frequency of a high-pass filter formed by a 100 nF capacitor and a 1 mH inductor (L filter).
Data:
C = 100 nF = 100 x 10-9 F
L = 1 mH = 1 x 10-3 H
F = ?
Applying formula 1:
